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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e785ec7370c7025296479cd59f3ed2f2c5a794c7def7006ba100d5b62d24449f' 
  AND token = 'YppLlr+6p8qbVaD4PkTPyPbeCLn7TlEDwuyx2ZQyC0E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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