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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'edb73cd3317e09aa0e3a76074ff534f1e389a6c5c00ee22cd290a9dd7fabd3d0' 
  AND token = 'Xp4TQl1gJxtphVKw1fcNfTnobDunBj5AV1cGXsyiZ6k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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