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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0eb10f14e3cf989442edcef0b4ba0ba7beb0e28760d17af51942af55bcadb788' 
  AND token = 'Rn0WrAWod4TYUXwFAK7wFIt8P/YlQ2LTixMXDbMlaXc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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