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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '443046c8edb1b3da0539919797c8d0cb1d9749bfb259f5a970977766c0f57349' 
  AND token = 'tvoszbDEIO8c6dZvzdmNew0ueN5Oi1YK7Nswle0j9/c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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