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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '676254714898512c07ae66eb5ffe89c20626f5be1fba1680fd6d82ffa4e5f57c' 
  AND token = '8BgGYp/tpfNX7nPWU7v/em5vV6xWIStFAhG33fP3AFg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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