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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4b4c1c8f6b3f637f9e98b048f0ea5d897454352b0428655bcebb92465d969769' 
  AND token = 'sy02IH2zmk9FNYJSd85mSo7QD6eW6CtHktNm5v0IYp0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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