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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd94b5a789a73191301befc705b20a7b0934cf6c94d94376c00c625e9f7d7a113' 
  AND token = 'yNDWBHgQaLGFR6CFk8m74VxiC9db5vikMaI2FuXuaOc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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