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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5332c4a46c81d81362d1898b2363108f4f3599e95f86c93dc401462f34664a52' 
  AND token = 'BXB9zE6tL4kX8yfSI3/vR/HbB8IGVcHeSH6l/xbkEtQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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