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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '36b694e2198444bcc75bab2e12dc7e18123a8b7835672c0eb4a01e38a4820b4e' 
  AND token = 'jJ2PNE9KX9amvWhErvO+I8sw3nqsfl7KnnIFLHPNr3k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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