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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4ffe402086e5d8d943471658f11a4abffea5dfe2e228654f1eb8027a8d46961a' 
  AND token = 'XvDhV6C2/19jroR6bWNSzE0jtsgk94DAeQyuMj/KhCs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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