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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'da2b5f6c4e6dafeafbb6099c6400e8038c935af5b37d0384f3d8b600255f3766' 
  AND token = 'tsfHlddTHhLD8YD7u/H69xPrH/q3+ZlYBno3PkR4+1E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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