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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6eb96551582724c10a0f85dfc094e1dd0e4172a103fedf4ada0f9362b81b4708' 
  AND token = 'Otygt3t2TjANPyR+SE0UvCuRwuVs0nWK0M2dIcCMFmA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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