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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '545818b4e91dcc38ba6da913ec46234c5f0f2d24a074d2134a3dd7fd85aba287' 
  AND token = 'u2acIAqTS8oN33LhHH8VyZKKKCUQWK6bb/xNQCCAs1c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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