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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5fa2c8917b3096d7b97b5d8fca450e3e01593595c255c708b33e7308d7805093' 
  AND token = '7x6xyqXvjKvOJCwAeGGpJaTu8IXbCK1TP5Qz76RAA/M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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