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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '073c96680315557a1ab631a8ea2463ee7107606318d83f9841dda5e70eaeab29' 
  AND token = '+pvCY5TTKCggGwHwL2Yo6ByC4TeiYFceuBvIUCWKOQk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}