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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a4952c338b19f39cd5be77626c42341fa3e493d1a69b48215b6cbf6e4c5c4b79' 
  AND token = 'aYAP4RlZcU8IXhdx7LtQva4DEwM5+1qKIEr5AabKF+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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