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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '566d4975d24e95480188d41486c7e3745e342c505bfd617b0ffe1aaa2e65f94a' 
  AND token = '+lFQ1tF0hER0lBa5eRLnMj/LPVcy2vu/QMDH1gbTw20=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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