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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5d102806185d790c411c84a6b33d23ea4d0ba0c9f7b49da6d57d813f6d17ef8f' 
  AND token = 'atRv6eFSmXCufQdTJo0n2jryBhmXy2oDvsTWyhJRKdU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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