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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '055c10402b5e0c70e67b2ae6ef5f615a0c6f82c5a5a8ff34f2235f9386c28dcb' 
  AND token = 'R2F4MeaBBeVYyiqeq+LEPpT639jwdhrssp1jon8SLIU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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