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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e1bc1f649a8eebf1ac0896786920fab41db87bed4fb7d4fdea08cb2d38ebabdc' 
  AND token = 'NQDJEORzisLISUEzQpznsw/hui/5earFLZadUz/VVgg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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