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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4519721513033aa47469ec6bbb114f58a2ae7a986fe2f55fd8228697fcc66940' 
  AND token = '5cvK33Te6rOv5gB+QbgqnM6hNdc6yNe1SPQngtc/lTM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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