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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c0c5da7f22afee255dd8721a6b25ae050934d1a8b3cfa01371f2eab365253b32' 
  AND token = 'UGtb8bjTi4AnuYL2Nfw4LpJCI3uznvEVesOihQ3qLZA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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