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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '052e8fe3bb2446cef49f2a5174414b0e04b1cb0a95dfc5ba1cfbff781d61b959' 
  AND token = 'mlm0Xtq+VNa9RqrgZsifp6L7IszeCeXBtOTPLntQkrw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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