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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '50038361782e24cfdad83fe4c7c081d02b88f702426d3ed397a28f16962d4900' 
  AND token = '/dR4+7oYeST6k1aJ0+i8/zqi/8nUkyd3ZQswSfGAzf8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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