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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cbb4342b00ca67bd35367e29eb24e61b04e842cbe9ab1be63f273fef2ad61fa0' 
  AND token = 'Syn8qPCNTvNkuu3aiS5X6qIQ/NfSisk+Y3956xreTTg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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