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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a76b85fa0ac652d73af0e3fc2e41f4cc6a9a506d73e1fcc5c97cb8b1d3769e31' 
  AND token = 'yeYmW1Yo6fqhhiCS+e2ZTrTjx1FFM1E0IoXTgzmODMY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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