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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3bb02d779e24f1d14e73a46fc2a7d5b3b5c5f77a39c303ce14bc9405314676b2' 
  AND token = '1kJHondWonrBm0TMXhVpEGCFs22qypTmexjlsTYNHg4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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