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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd235c668e0c85c616d24d501e4860b3e98a914cf869668630b9d4e46582e63bb' 
  AND token = 'xmMvYo/qzRN3r0sksHIXqxsOVAxP8ffMNNt6B2j03jE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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