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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5e94d9edfae7252bdf4ccfc2d8b945a20eced9e735b8022cd10867348b0c56e3' 
  AND token = '5bcIyfyPCcVReESTBT6vP7OI54WTjV4/WmpxrWl0J6Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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