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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '35568d8d49731e2c1cafb78bdfafa9438760766e3c132ba3658a5415ff4a68a6' 
  AND token = 'ZHhVKTktftMBJmQ0Dy2AsCVo4HE6FnNKr8fseC5PLBQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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