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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b01162c0f079721d275aefceb1cf97c73f651df1d52da3d436594a20a5ad20cd' 
  AND token = '02ZlWUeDrzIR+zGDYQ/o29NMS8PDLujaCx5YKd8+fv4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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