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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f38e55ad677698ebc2472d6f2d76979904bfd5b977e80e2508f99054e958dea8' 
  AND token = 'MGoPpyclfnC7w8e1nrnBPnh/QFIcW0crfCAUCOhOSIQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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