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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '40341bb4488f0abbe04a46eedd09399d9f41f41acd0a320085628d2094a395fa' 
  AND token = 'PSR0Y9zRDTfrauUT5z5AfGA7ZhPFrrKL38/oDk89wjs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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