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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '27385717a63a0d33863ebf142155a3a9541529d445afa21b96a1c4ff3576f14e' 
  AND token = 'rZNa3WJwHqo6smVAXTmqU8XxEDqEooDgkBGYarboFGo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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