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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3489fbad589ad6f907ae86c3dd198e3826bc4d6aa2cbfbe147cd8e9e33abb313' 
  AND token = 'iEA3i1Q3RP5g/YHFl+AtYz8soyLiQXEE3T0AlKGR+aU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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