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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a85fb22e971bed62bae629b0252f7da0386af1d29a9e2a2a795bb8c17615ccb9' 
  AND token = 'TcBO2Dhe56X+jp9KBsCqh4yTE/JgdQKeWvk++TAlhsE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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