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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '396ca97c80a088fe6b555999c3fea2c6c8e6b210fbc3ed4165f74f69a5388ed6' 
  AND token = 'gQp9Xx7i0PglTxfD2sjw1GjlKDcxtz8mPWFEL3ESXEc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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