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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e9721185790e5483974f73ecb7e34ee7f6ca5919773b6ae66921570810e1d5d7' 
  AND token = 'ARdPIuex2DvHyR/61pOQnQOvH0Lobb/7hzWNYfk/tAk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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