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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5f572e78a7c31a7e55dc2d4bdd0dc70a1f3c798467c93a3986d33daaf87dced6' 
  AND token = 'tGLTlhQGic2p+AnT6kd84t8sjinj8HXyVOLp/6LNgDg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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