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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cce7a956ed17f5fac091b98f03898a9268bf794e55c142f6bca2ddad04c760f8' 
  AND token = 'av74o1t/sb8sC5klRb1r4Z7Y2MxNSwnTjIdb5iqH4fI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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