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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e2edea7b86e4e0ae2fae3c677497b2ed7650fb134112423deabbd20c5fb31f28' 
  AND token = 'TwuYs/LNVcT3V29M15OqfgvPB5YIU+pZZUsp73dmdpA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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