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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '20e71b56144178c564c312aa0e20a4ffd2c68412f4909f1c3de8e5d289b20f4a' 
  AND token = 'T4quA4eLntUKC5NL7tfYOjbMgGGMwAFm/TabreFNGq0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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