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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c3ae27ad2d745372e1a4dc61d130dd44a2ca4675edab1f2f0cf9c3beade27153' 
  AND token = 'I2UqgIBD9QQVvT2whxHuCaLunCYNbSjZtZvqtDCZYsY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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