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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cd7c80336eab1a7b07912e06e5dbf5dec7d7ac457dcfe19e75811b7c2f82581e' 
  AND token = 'QWc0pTTO6OPncANLgdUfdChdTOYprEq8xeMFlz4I1NM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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