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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b8e1174b739aba8be96fe72dbea85b6050eb1a4a9a1bec508c52fdee6b2ec01f' 
  AND token = 'wuJ6s25x4GMF5F498QWDaVgD1+a/icKbw0ATE6RKxTY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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