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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6afa0ddb11506b948cd62dab607defbbf6b1083c16a2dcc606afbbb4792861b4' 
  AND token = 'PncbVHHeNtlpeEOFMkWH6tGN3hSPIV61Fd8tLzrLWwY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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