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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dd48f3b43cda17155e5fa65d95796c7ba1c4bc2fdb20462ef96a5a6001392dc0' 
  AND token = '1pK0sTCeF5yebp0oc8e28I85Xt+VdS7mWHzKHJBeIEc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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