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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd59654819912df4d104570528ccda58edfac220b5210bc6d1752f25054503b34' 
  AND token = 'S7eKyNq8mtAP/hmv3Nu6m3IdOINBbCtSuNu8dwqymxo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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