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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0bde74cca71fdf18c95ce300b821f351885e35a6a30d8ab1f8c836b94a6b541d' 
  AND token = 'zdHgiSpTh3Mv25b4pcnm0kQw5f7KkKA/mr5YK/yvTqI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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