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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c62ed82b807cc16a19151a6e1bd5b7b8bc83a66a26d9190f6ef5816a9ac1056f' 
  AND token = 'IET2fxf8wnjJx7Z17Ki5bqJ/BrVd1srhzwvegtPKL7g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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