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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '16707c35189af46d2e34a9284dee676ae21fc790282c379b401072f1a989a17c' 
  AND token = 'vr6jtQ3y60wEi9k5BBf8MkRXtWdkuL7lJCcqd6CUn/o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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