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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd6250f3aba2f9d8f25f8c8c3ed82cb44dc0f6a51fc0492f427d1410bb50d88d7' 
  AND token = 'vBwFM/k77x9ySejPUxB0U2sCgxZUUtRPfvaEEYlWCiM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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