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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '874a25bcc203677f3535e3efe6385576dedede034157a4e8882fa612592088d5' 
  AND token = 'Yh1mCbicRTf70+8iwXTPhe1c/L9kSdlTIdRhFZ9KFvw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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