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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b3d0154b4dcb867009d6b58bede1e63c1f1a40e7927a591a4a49485dae1b595d' 
  AND token = 'BJ/MccDx2qdOgdc/Bw4q0lHn/ObKxE0bvazFNENcQVc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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