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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bd8ce40daf82ab2ada33f674c0b2dd4cf0219922a8f0a045f39b555ce7bb09ef' 
  AND token = 'FEfczXz/xJY0qVqgNhrg5DY3INPZEyTH0Peng/K8fUE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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