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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ffb82f264341c91c7a1871db910af38a1ca397bd1a024c7d9af52c26c91ba43b' 
  AND token = '6BZ9+sEROUhf9WO3ATBmD0gJ+Q1mu+UjZzfiM60kUPs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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