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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd2625a0a27c8daa8554b16961e29f6f2f607ff7c0b26fa069eeb42eb52d39ce3' 
  AND token = '+cag22WNagnFSTRorUGIGteAKVIiXZvcFc93z0TCy4w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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