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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c6988a2b5bd9766441e0fe96f1fac19da86165724bf0836b0babd4e8c6eb9461' 
  AND token = 'haquTNifa9vV/FtxnHseEX85xva8Xp/S03K+fmfgMDM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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