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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '216aca4525eb88f4e638f3821f3896744bfb082aacf509ee5b5ac5ad114b63d8' 
  AND token = 'KSt3X/a9BJMO3vN5lMi0pTrdP/EwcCepgs5Zyte3ql0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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