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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c700a381b134c4aeac5658d5f0b6a10f1d6cdfe160753afed8151386cb90f18e' 
  AND token = 'XPX0cDwdokFQ8/Xi9u10Ts4+ol2tJlKr+L8+wgHCkYg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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