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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f95541d86eac5044e2ec8bc63ed741dab36aa38516d7b5eb742faabf03468e03' 
  AND token = 'MN82dpR/DpGF9nyoLp8mc/yeYnjNW8VZOxvPI8e3T8w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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