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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7e9d8fc29fbfa378472f258a05b355be63c5b20b3bedacefc1e33880f0e3ff5f' 
  AND token = 'oq3pKDko+6RzNAQf8c88t/q0ws/lKK0NmMiYjtVy6Tg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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